SOLUTION: An airplane flew for 3 hours with a tail wind of 18 kilometers per hour. The return flight against the wind took 4 hours. Find the rate of the plane in still air.

Question 423288: An airplane flew for 3 hours with a tail wind of 18 kilometers per hour. The return flight against the wind took 4 hours. Find the rate of the plane in still air.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
plane speed =x mph
wind speed 18 mph
time with tail wind 3 hours
time against wind 4 hours
Distance = same
8(x+18) =4(x-18)
8x +144 =4x-72
4x-8x=144-72
x =216 mph plane speed

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